Teledyne Camera Accessories T100 Benutzerhandbuch

  Check for disconnected cables to the sensor module. 
  Carry out an electrical test with the ELECTRICAL TEST (ETEST) procedure in 

the diagnostics menu, refer to Section 5.9.5. If this test produces a concentration 
reading, the analyzer’s electronic signal path is working. 

  Carry out an optical test using the OPTIC TEST (OTEST) procedure in the 

diagnostics menu, refer to Section 5.9.4. If this test results in a concentration signal, 
then the PMT sensor and the electronic signal path are operating properly. If the M 
passes both ETEST and OTEST, the instrument is capable of detecting light and 
processing the signal to produce a reading. Therefore, the problem must be in the 
pneumatics, optics or the UV lamp/lamp driver. 

Leaks in the T100 or in the external gas supply and vacuum systems are the most 
common source of unstable and non-repeatable concentration readings. 

  Check for leaks in the pneumatic systems as described in Section 11.3.6. Consider 

pneumatic components in the gas delivery system outside the T100 such as a change 
in zero air source (ambient air leaking into zero air line or a worn-out zero air 
scrubber) or a change in the span gas concentration due to zero air or ambient air 
leaking into the span gas line. 

  Once the instrument passes a leak check, perform a flow check (refer to Section 

11.3.7) to ensure that the instrument is supplied with adequate sample gas. 

  Confirm the UV lamp, sample pressure and sample temperature readings are correct 

and steady. 

  Verify that the sample filter element is clean and does not need to be replaced. 

In general, the T100 will not display certain control buttons whenever the actual value of 
a parameter is outside of the expected range for that parameter. If the calibration menu 
does not show a SPAN button when carrying out a span calibration, the actual 
concentration must be outside of the range of the expected span gas concentration, 
which can have several reasons. 

  Verify that the expected concentration is set properly to the actual span gas 

concentration in the CONC sub-menu. 

  Confirm that the SO

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 span gas source is accurate.  

  If you are using bottle calibration gas and have recently changed bottles, bottle to 

bottle variation may be the cause. 

  Check for leaks in the pneumatic systems as described in Section 12.6.1. Leaks can 

dilute the span gas and, hence, the concentration that the analyzer measures may fall 
short of the expected concentration defined in the CONC sub-menu. 

  If the physical, low-level calibration has drifted (changed PMT response) or was 

accidentally altered by the user, a low-level calibration may be necessary to get the 
analyzer back into its proper range of expected values. One possible indicator of this 
scenario is a slope or offset value that is outside of its allowed range (0.7-1.3 for 
slope, -20 to 150 for offsets). Refer to Section 12.7.2.8 on how to carry out a low-
level hardware calibration. 

06807C DCN6650